August weather forecast and climate
Tokyo, Japan

A stunning view of the cityscape of Tokyo, Japan, taken at dusk
A stunning view of the cityscape of Tokyo, Japan, taken at dusk
The last month of the summer, August, is a hot month in Tokyo, Japan, with average temperature fluctuating between 31°C (87.8°F) and 25.1°C (77.2°F).

Temperature

The warmest month is August, with an average high-temperature of 31°C (87.8°F) and an average low-temperature of 25.1°C (77.2°F).

Heat index

In August, the average heat index is calculated to a sweltering 38.5°C (101.3°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'felt air temperature', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, wind, metabolic differences, and differences in body mass, height, and shape affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In August, the average relative humidity is 73%.

Rainfall

In Tokyo, it is raining for 9.7 days, with typically 26mm (1.02") of accumulated precipitation. Throughout the year, there are 134.5 rainfall days, and 425mm (16.73") of precipitation is accumulated.

Snowfall

In Tokyo snow does not fall in April through December.

Sea temperature

August is the month with the warmest seawater in Tokyo, with an average sea temperature of 25.7°C (78.3°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In August, the average length of the day in Tokyo is 13.5h.

Sunshine

August has the most sunshine of the year, with an average of 10.3h of sunshine.

UV index

The average daily maximum UV index in Tokyo is 6. A UV Index reading of 6 to 7 represents a high health hazard from the exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 6 in August transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the warmest month in Tokyo?

With an average high-temperature of 31°C (87.8°F) and an average low-temperature of 25.1°C (77.2°F), August is the warmest month in Tokyo.

What is the temperature in August in Tokyo?

The average high-temperature, in August, in Tokyo, Japan, is 31°C (87.8°F), while the average low-temperature is 25.1°C (77.2°F). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), that represents influence of the relative humidity to air temperaure, is calculated to 38.5°C (101.3°F).

What is the average humidity in August in Tokyo?

In Tokyo, Japan, the average relative humidity in August is 73%.

How much does it rain in Tokyo in August?

In Tokyo, Japan, during August, the rain falls for 9.7 days and regularly aggregates up to 26mm (1.02") of precipitation.

When it does not snow in Tokyo?

In Tokyo, Japan, snow does not fall in April through December.

When is the sea warmest in Tokyo?

August is the month with the warmest seawater in Tokyo, with an average sea temperature of 25.7°C (78.3°F).

What is the water temperature in August in Tokyo?

In Tokyo, Japan, the average seawater temperature in August is 25.7°C (78.3°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

How many hours of daylight does Tokyo have in August?

In August, the average length of the day in Tokyo is 13.5h.

What month has the most sunshine in Tokyo?

With an average of 10.3h of sunshine, August has the most sunshine of the year.

How long on average sun shines in August in Tokyo?

In August, the average sunshine in Tokyo, Japan, is 10.3h.

How high is the UV index in August in Tokyo?

The average daily maximum UV index in August in Tokyo is 6. A UV Index of 6 to 7 symbolizes a high health threat from the exposure to the Sun's UV rays.
Average temperature in August - Tokyo, Japan
  • Average high temperature in August: 31°C

The warmest month (with the highest average high temperature) is August (31°C).
The month with the lowest average high temperature is January (8.9°C).

  • Average low temperature in August: 25.1°C

The month with the highest average low temperature is August (25.1°C).
The coldest month (with the lowest average low temperature) is January (2.8°C).

Average pressure in August - Tokyo, Japan
  • Average pressure in August: 1010.2mbar

The month with the highest atmospheric pressure is November (1018.1mbar).
The month with the lowest atmospheric pressure is June (1009.2mbar).

Average wind speed in August - Tokyo, Japan
  • Average wind speed in August: 12.5km/h

The windiest month (with the highest average wind speed) is April (15.3km/h).
The calmest month (with the lowest average wind speed) is November (12.1km/h).

Average humidity in August - Tokyo, Japan
  • Average humidity in August: 73%

The month with the highest relative humidity is July (77%).
The month with the lowest relative humidity is January (59%).

Average rainfall in August - Tokyo, Japan
  • Average rainfall in August: 26mm

The wettest month (with the highest rainfall) is October (51mm).
The driest month (with the least rainfall) is December (21mm).

Average rainfall days in August - Tokyo, Japan
  • Average rainfall days in August: 9.7 days

The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is January (7.3 days).

Average snowfall in August - Tokyo, Japan
  • Average snowfall in August: 0mm

The month with the highest snowfall is February (21mm).
Months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).

Average snowfall days in August - Tokyo, Japan
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is February (2.3 days).
Months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

Average sea temperature in August - Tokyo, Japan
  • Average sea temperature in August: 25.7°C

The best month for swimming (with the highest average sea temperature) is August (25.7°C).
The coldest month (with the lowest average sea temperature) is February (14°C).

Average daylight in August / Average sunshine in August - Tokyo, Japan
  • Average daylight in August: 13.5h

The month with the longest days is June (Average daylight: 14.5h).
The month with the shortest days is December (Average daylight: 9.8h).

  • Average sunshine in August: 10.3h

The month with the most sunshine is August (Average sunshine: 10.3h).
The month with the least sunshine is February (Average sunshine: 5.8h).

Average sunshine days in August - Tokyo, Japan
  • Average sunshine days in August: 19.1 days

The month with the most sunshine days is January (21.8 days).
The month with the least sunshine days is June (14.4 days).

Average UV index in August - Tokyo, Japan
  • Average UV index in August: 6

The month with the highest UV index is July (UV index 7).
Months with the lowest UV index are January, February, March, November and December (UV index 3).

Average cloud cover in August - Tokyo, Japan
  • Average cloud cover in August: 33

Months with the most cloud cover are June and October (Cloud cover 43).
The month with the least cloud cover is January (Cloud cover 28).

Average visibility in August - Tokyo, Japan
  • Average visibility in August: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).